class person:
    pass
p = person()
print p



class man:
    def sayhi(self):
        print "hello .hao are you"
p = man()
p.sayhi()


class woman:
    def __init__(self,name):
        self.name = name
    def sayHi(self):
        print "helo my name is",self.name
p  = woman('johnm')
p.sayHi()